Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
sach thu » sach thue, sach thieu, sach tham
van hanh » van thanh, ban hanh, van anh
dao tuc » dao duc
lai cua » dai cua, hai cua, lai chau
tuc van » thuc van, truc van, tuc va
cua tre » cua te, cuu tre, cua triet
sach tu » cach tu, sach ty, sach uu
hieu va » hieu qua
nang xa » nang x, lang xa, nang ma

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach tu) or (sach thu)) nang xa hoi. ((hieu va) OR (lieu va)) dao tuc van hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach tu) OR (sach thu)) nang xa hoi. ((hieu va) OR (lieu va)) dao tuc van hanh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach tu) or (sach thu)) nang xa hoi. ((hieu va) OR (lieu va)) dao tuc van hanh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach tu) or (sach thu)) nang xa hoi. ((hieu va) OR (lieu va)) dao tuc van hanh lai cua tre*.